Determine the amount of backfill needed for the continuous footing and foundation in Problem 35.
What will be an ideal response?
From Problem 35 the depth of excavation was 2 ft, the length of the wall was 122 ft, and quantity of excavation was 54.2 bcy. Find the volume of the footing and foundation:
Footing volume = 122? × 2? × 1? = 244 cf / 27 cf per cy = 9.0 cy
Foundation volume = 122? × 1? × 8? / 12 in per ft = 81 cf / 27 cf per cy = 3.0 cy
Find the volume of the backfill. The backfill will be in compacted cubic yards (or feet).
Backfill (ccy) = 54.2 bcy – 9.0 cy – 3.0 cy = 42.2 ccy
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